Does Smile Pro Surgery Reshape the Cornea?

Yes — But Not the Way You Might Expect

SMILE Pro absolutely reshapes the cornea. That reshaping is what corrects your vision — by altering the cornea’s curvature, light is bent to land precisely on the retina instead of in front of it. What surprises people is the method. Older laser procedures reshape the cornea by removing tissue from its surface or from beneath a flap. SMILE Pro does it from within, by extracting a single, precisely shaped piece of tissue through a tiny opening.

That difference in approach is the whole story of why SMILE Pro behaves as it does. To see how it sits alongside other techniques, our comparison of how SMILE Pro differs from LASIK and PRK is a helpful overview before we get into the mechanics.

How SMILE Pro Reshapes the Cornea

SMILE Pro is performed on the VisuMax 800 femtosecond laser, and the reshaping happens in two precise steps.

Step One: Creating the Lenticule

The laser fires ultra-fast pulses of light to a programmed depth inside the cornea, defining a small, lens-shaped disc of tissue called a lenticule. The exact dimensions of that disc are calculated from your prescription — its shape is, in effect, your refractive error translated into tissue. No cutting of the surface happens at this stage; the laser works entirely within the cornea.

Step Two: Removing the Lenticule

The surgeon then removes that lenticule through a small keyhole incision, just a few millimetres wide. Once the disc of tissue is gone, the cornea’s curvature settles into its new, corrected shape — flatter in the centre for short-sightedness, for example. That’s the reshaping, complete.The precise amount involved is covered in our guide on the procedure’s cylindrical correction range.

Which Part of the Cornea Is Reshaped?

The reshaping takes place in the corneal stroma — the thick, collagen-rich middle layer that makes up roughly 90% of the cornea’s thickness and gives it most of its structure. The lenticule is cut and removed from within this layer, while the outermost layers (the epithelium and Bowman’s layer) stay largely undisturbed.

This matters because the stroma is where refractive correction has always happened in laser surgery — it’s the tissue whose removal changes the cornea’s focusing power. The difference with SMILE Pro is that it reaches the stroma without lifting or removing the surface above it. For the deeper science of why this layer is central to vision correction.

How This Differs From LASIK and PRK

All three procedures reshape the stroma — they just reach it differently, and that’s where the experience diverges:

• PRK removes the surface epithelium entirely, then reshapes the stroma from the surface with an excimer laser. The epithelium regrows over several days.
• LASIK creates a hinged flap across the front of the cornea, lifts it, reshapes the stroma beneath, then lays the flap back down.
• SMILE Pro creates and removes a lenticule from inside the stroma through a small incision — no surface removal, no flap.

So the destination is the same, but SMILE Pro takes the least disruptive route to get there. A side-by-side look at the femtosecond approaches is set out in our comparison of SMILE Pro versus Femto LASIK, which shows how the flapless method changes the patient experience.

Why the Method Preserves Corneal Strength

Here’s the structural payoff of reshaping from within. The front layers of the cornea contribute significantly to its overall strength, rather like the outer skin of a structure. Because SMILE Pro doesn’t cut a large flap through those layers, more of that strength is preserved, which supports better long-term stability of the cornea.

This is also why SMILE Pro is often a strong option for people whose corneas need that strength conserved.

Is the Reshaping Permanent?

Yes. Once the lenticule is removed, that tissue is gone for good, and the cornea’s new shape is permanent. The surface heals over the small incision within days, and the cornea settles into its corrected curvature — a process described in does the cornea heal after SMILE Pro. The correction itself is designed to last.

It’s worth noting that “permanent reshaping” doesn’t freeze your eyes in time — natural age-related changes, such as the reading-vision shift of presbyopia in your forties, still happen because those involve the lens, not the cornea. But the myopia or astigmatism SMILE Pro corrects, and the corneal shape it creates, remain stable. For how effectively it handles stronger prescriptions, see can SMILE Pro fix high myopia.